I have always taken the cup from home to the university (about 3/4 hour on the way) to since then zutrinken my coffee in peace. The drinking temperature was acceptable (of course not as hot as the freshly brewed coffee).
Deduction there because the coffee cup is not 100% leak-proof. - As long as MA ensures that the coffee cup is transported vertically there are no problems. If the coffee cup but transported horizontally, it may happen that when you open some coffee bib (preferably a handkerchief with you).
The protective sleeve is very convenient, it ensures that the coffee stays hot longer, and if minimal expires something the coffee is not distributed throughout the backpack.
The best is the look that always gone down well with me and also with the people who have seen the coffee Beecher.
Capacity is ideal for a person (a large coffee ca 0,4 l)!
Bin overall very impressed!
(Note: The first time you open a slightly strange smell is present, but it disappears after a short Rinse off)